knows one's ass from one's elbow

Questions

What does knows one's ass from one's elbow mean?

third-person singular simple present indicative of know one's ass from one's elbow

How to pronounce knows one's ass from one's elbow

1. Open the pronunciation page — Open the Speakur entry for “knows one's ass from one's elbow”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “knows one's ass from one's elbow”.
4. Repeat and practice — Say “knows one's ass from one's elbow” aloud, matching stress and vowels until it feels natural.